Displaying 20 results from an estimated 800 matches similar to: "nth step transition matrices"
2005 Mar 29
2
strange error with rw2010dev
With rw2010dev I get a strange protect(): protection stack overflow
error with a small data frame which otherwise is usable:
If anybody wants to have a look I can provide an RData file
with the problematic data frame.
Doesn't seem to be necessary, the following simulated example
generates the error:
> testmat <- matrix(1:80, 20,4)
> dim(testmat)
[1] 20 4
> str(testmat)
int
2011 May 25
1
matrix Manipulation...
Hello everyone,
I have a 2 x 5 matrix: say
0.2 0.3 1 -1 3
0.2. 0.4 5 0.5 -1
I want to replace all the values greater than or equal to 1 with 1 and those
less than or equal to 0 with 0. So I should end up with a mtrix looking
like:
0.2 0.3 1 0 1
0.2. 0.4 1 0.5 0
Any ideas how to do this?
--
Thanks,
Jim.
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2008 May 06
5
How do I write a sum of matrixes??
Hello best helpers,
I am a new user and I have been struggling for hours. So finally I decide to ask you:
If I have a matrix P, and P.2 = P%*%P, and P.3=P.2%*%P
is there a function to calculate the power of a matrix?? if not how can i do:
for (i in 1:10) {P.i=P^i}
after this I need to sum them up and my problem is to combine P and i to P.i can anyone help me please???
Thanks and have a nice
2010 Nov 18
1
dmultinomial
Hello All,
I'm trying to run a maximum likelihood analysis using dmultinomial (i'm
avoiding dmultinom as I'd like to run it with vectors for the ML stuff).
However, I'm having a hard time getting even the simplest example
running. Any help would be greatly appreciated.
> library(mc2d)
> dmultinomial(x=c(0,0,1),prob=c(1,1,1),size=1,log=TRUE)
Error in if (ncol(x) != K)
2011 Dec 16
1
kmeans and plot labels
Hi,
Thanks Sarah. Unfortunately I did not get a step further.
My question, perhaps a bit clearer, is how to display the case control status (or any other arbitrary point label) after clustering in a plot:
With a bit of pseudo code, where dataset is a data.frame, parameters are those column names where we find numerical values (no NAs) and nclasses is the desired number of classes.
fit <-
2010 Oct 22
3
Conditional looping over a set of variables in R
Here's the problem I'm trying to solve in R: I have a data frame that consists of about 1500 cases (rows) of data from kids who took a test of listening comprehension. The columns are their scores (1 = correct, 0 = incorrect, . = missing) on 140 test items. The items are numbered sequentially and are ordered by increasing difficulty as you go from left to right across the columns. I want
2010 Dec 13
7
descriptive statistics
Hi. In a data set I have a variable that takes values from 1 to 14. For each
subgroup of values of this variable, I would like to obtain some descriptive
statistics of other variables present in the data set. I've been trying with
a "for" loop but I couldn't get nothing. Could you please suggest me some
lines?
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2009 Mar 19
2
nth root
Hi,
Is there a function in R to calculate the nth root, similar to the
MATLAB function NTHROOT()?
Thanks,
Martin Biuw
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2011 Oct 21
2
plotting with a symbol on every nth point
Hi,
I would like to produce a plot with a symbol on every nth point in a time
series data, like the one in the following:
http://www.phon.ucl.ac.uk/home/yi/ProsodyPro/EnglishFocus.png
x <- seq(-100,1000,25)
plot(x,type="l")
Could someone help me out with the above example?
Thanks....
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2012 Apr 05
3
Apply function to every 'nth' element of a vector
Dear R users,
how do I e.g. square each second element of a vector with an even
number of elements? Or more generally to apply a function to every
'nth' element of a vector. I looked into the apply functions, but
found no hint.
For example:
v <- c(1, 2, 3, 4)
mysquare <- function (x) { return (x*x) }
w <- applyfun(v, mysquare, 2)
then w should be c(1, 4, 3, 16)
Thanks for
2005 Oct 25
1
selecting every nth item in the data
I want to make a glm and then use predict. I have a fairly small sample
(4000 cases) and I want to train on 90% and test on 10% but I want to do
it in slices so I test on every 10th case and train on the others. Is
there some simple way to get these elements?
Stephen
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21/10/2005
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2009 Jul 07
3
Answering the nTh call ...
Curious to know if anyone's created something similar to the following,
if so and you'd care to share an AGI or dialplan, much appreciated.
I will be eventually write a script to answer the nTH call. (if I can't
find it (why reinvent wheels).
Looking to do some testing sending anywhere between 50-200 calls to a
machine. I'd like a Snom/Polycom/whatever to pick up after the nTh
2008 Feb 25
1
Plotting series marked with a symbol on every nth data point, preferably in ggplot...
Hello!
I am working with signals and a plot of several signals on the same
axes can get quite messy. With lines that are very fractured,
distinction by only the linestyle is not very clear. If I add symbols
to the plot however, there are so many symbols, that they overplot and
the whole plot is unreadable once again. I am looking for advice on
how to make a plot with continuous lines and symbols
2009 Aug 18
2
value of nth percentile
Dear All,
I have to get the value of say 90th percentile of precipitation time series.. The series is of daily precipitation value of 96 years, I have to to get 90the percentile value of daily precipitation each year. If you know the R code or command for this please let me know.
I would appreciate your early response.
Thanking you,
Sincerely,
Ajay.
2005 Apr 29
1
problem with nth patch, counter parameter...I think
Hi all, I need some guidance to get my problem fixed. I believe there
is an issue with the ''nth'' patch from the patch-o-matic, which is
labeled as status ''works''.
I have tunnels back and forth across the internet, using ''nth'' to
balance packets between different public networks (over the tunnels).
I need to access some networks over two
2012 Jan 08
1
Difference across the Nth dimension of an array
I have a multidimensional array - in this case with 4 dimensions of x,y,z
and time. I'd like to take the time derivative of this matrix, i.e.
perform the diff operator along dimension number 4.
In Matlab, there is a simple option to specify which dimension the
difference is to be taken across., but I can't see this in R.
I realise I can use aperm to rotate my array so that time is in
2010 May 13
2
Adding name to nth row
Hello,
I have a data frame with many rows, and I want to create a column with
a name only at every 12th row, starting from 97 to 278.
Thanks in advance!
2001 Mar 28
4
How to extract every nth element from a vector
R-helpers:
Is there a simple way to extract every nth element from a very long vector?
[The vector I want to sample from is an object returned by lowess(). It is
so long (11,628 pairs of elements) that it is causing non-R-related memory
problems elsewhere. I don't see a better way other than sampling the output
returned from lowess.]
Thanks in advance.
Barry Cooke
2012 Jul 11
4
MODE , VARIANCE , NTH PERCENTAILE
Hi,
Here i have an matrix like this,
ABC PQR XYZ MNO
------ ------- ------ --------
3 6 7 15
2 12 24 15
20 5 1 2
25 50 15 35
i need to get the
"MODE" - for each column-wise
"VARIANCE" - for
2012 Dec 02
2
How to calculate mean of every nth time series data with zoo or xts ?
Hello,
I have 1-minute time series stock data and I'd like to calculate mean of every n-th candle data of m-days.
result = c(mean of 1th data, mean of 2nd data, ...)
mean of 1th data = (1th data of 2012-1-1 + 1th data of 2012-1-2 + 1th data of 2012-1-3) / 3
mean of 2nd data = (2nd data of 2012-1-1 + 2nd data of 2012-1-2 + 2nd data of 2012-1-3) / 3
...
Could you let me know the fastest